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location  University of Copenhagen  
age  29  
visits  member for  5 years, 9 months 
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2d

awarded  Enlightened 
2d

awarded  Nice Answer 
Jul 30 
comment 
What's the relationship between the different versions of the BBD decomposition theorem?
Regarding whether you can deduce Version 1.a from Version 1, I don't believe that there's a direct argument. What you need to know is that $f_\ast \mathrm{IC}_X \in D^b_c(Y)$ is actually constructible wrt the stratification $\{S_\lambda\}$. 
Jul 30 
comment 
What's the relationship between the different versions of the BBD decomposition theorem?
I agree with Ben Webster  what's your definition of geometric origin? I would say that $K$ is of geometric origin if it can be obtained from the trivial perverse sheaf over a point by applying the standard six functors and forming subquotients; in particular, every summand of $f_\ast K$ in Version 2 ought to be of geometric origin by definition, and the only nontrivial part of the statement is semisimplicity. 
Jul 30 
answered  Do modular forms show up in the cohomology of moduli spaces of unmarked curves? 
Jul 13 
awarded  Nice Answer 
Jun 26 
comment 
Number of $\mathbb F_p$ points constant mod $p$?
A remark is that Fulton's trace formula only applies to compact $X$, whereas Allen is specifically considering affine varieties (whose coherent cohomology will be a bit uninformative). 
Jun 26 
answered  Number of $\mathbb F_p$ points constant mod $p$? 
Jun 16 
revised 
Tate twist and comparison between Betti and de Rham cohomology
added 36 characters in body 
Jun 16 
answered  Tate twist and comparison between Betti and de Rham cohomology 
May 18 
answered  Extending the AbelJacobi map over the DMcompactification $\overline{\mathcal{M}}_2$? 
May 13 
awarded  Nice Answer 
May 12 
awarded  Nice Question 
May 7 
revised 
genus 2 Siegel theta series of 3dimensional lattices
deleted 1 character in body 
Apr 29 
awarded  Deputy 
Apr 29 
awarded  Good Answer 
Apr 20 
reviewed  Leave Open 'Stalk' of vanishing cycles at $k$point 
Apr 15 
comment 
Identify ring of polynomials symmetric under forgetting variables
Should your equation say $p(x_1,\dots,x_{n1},0)=p(x_1,\dots,x_{i1},0,x_{i+1},\dots,x_{n})$? 
Apr 12 
comment 
Models for the moduli space $\overline{M}_{1,n}$
If you send me an email I can send you Belorousski's thesis as pdf. 
Apr 1 
comment 
Character table of $\mathrm{SL}_2(\mathbb{Z}/p^n\mathbb{Z})$
Also, if you send me an email I can send you a copy of Kutzko's PhD thesis. 